CVE-2024-35811

MEDIUM
Published May 17, 2024 Modified May 12, 2026 CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach This is the candidate patch of CVE-2023-47233 : https://nvd.nist.gov/vuln/detail/CVE-2023-47233 In brcm80211 driver,it starts with the following invoking chain to start init a timeout worker: ->brcmf_usb_probe ->brcmf_usb_probe_cb ->brcmf_attach ->brcmf_bus_started ->brcmf_cfg80211_attach ->wl_init_priv ->brcmf_init_escan ->INIT_WORK(&cfg->escan_timeout_work, brcmf_cfg80211_escan_timeout_worker); If we disconnect the USB by hotplug, it will call brcmf_usb_disconnect to make cleanup. The invoking chain is : brcmf_usb_disconnect ->brcmf_usb_disconnect_cb ->brcmf_detach ->brcmf_cfg80211_detach ->kfree(cfg); While the timeout woker may still be running. This will cause a use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker. Fix it by deleting the timer and canceling the worker in brcmf_cfg80211_detach. [[email protected]: keep timer delete as is and cancel work just before free]

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
debian debian_linux

References

Advisories & Patches

https://git.kernel.org/stable/c/0a7591e14a8da794d0b93b5d1c6254ccb23adacb https://git.kernel.org/stable/c/0b812f706fd7090be74812101114a0e165b36744 https://git.kernel.org/stable/c/0f7352557a35ab7888bc7831411ec8a3cbe20d78 https://git.kernel.org/stable/c/190794848e2b9d15de92d502b6ac652806904f5a https://git.kernel.org/stable/c/202c503935042272e2f9e1bb549d5f69a8681169 https://git.kernel.org/stable/c/6678a1e7d896c00030b31491690e8ddc9a90767a https://git.kernel.org/stable/c/8c36205123dc57349b59b4f1a2301eb278cbc731 https://git.kernel.org/stable/c/8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1 https://git.kernel.org/stable/c/bacb8c3ab86dcd760c15903fcee58169bc3026aa https://git.kernel.org/stable/c/0a7591e14a8da794d0b93b5d1c6254ccb23adacb https://git.kernel.org/stable/c/0b812f706fd7090be74812101114a0e165b36744 https://git.kernel.org/stable/c/0f7352557a35ab7888bc7831411ec8a3cbe20d78 https://git.kernel.org/stable/c/190794848e2b9d15de92d502b6ac652806904f5a https://git.kernel.org/stable/c/202c503935042272e2f9e1bb549d5f69a8681169 https://git.kernel.org/stable/c/6678a1e7d896c00030b31491690e8ddc9a90767a https://git.kernel.org/stable/c/8c36205123dc57349b59b4f1a2301eb278cbc731 https://git.kernel.org/stable/c/8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1 https://git.kernel.org/stable/c/bacb8c3ab86dcd760c15903fcee58169bc3026aa

Frequently Asked Questions

What is CVE-2024-35811? +
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach This is the candidate patch of CVE-2023-47233 : https://nvd.nist.gov/vuln/detail/CVE-2023-47233 In brcm80211 driver,it starts with the following invoking chain to start init a timeout worker: ->brcmf_usb_probe ->brcmf_usb_probe_cb ->brcmf_attach ->brcmf_bus_started ->brcmf_cfg80211_attach ->wl_init_priv ->brcmf_init_escan ->INIT_WORK(&cfg->escan_timeout_work, brcmf_cfg80211_escan_timeout_worker); If we disconnect the USB by hotplug, it will call brcmf_usb_disconnect to make cleanup. The invoking chain is : brcmf_usb_disconnect ->brcmf_usb_disconnect_cb ->brcmf_detach ->brcmf_cfg80211_detach ->kfree(cfg); While the timeout woker may still be running. This will cause a use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker. Fix it by deleting the timer and canceling the worker in brcmf_cfg80211_detach. [[email protected]: keep timer delete as is and cancel work just before free] It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-35811? +
CVE-2024-35811 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-35811? +
CVE-2024-35811 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-35811? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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